Who can best define evil and how we can guard against individuals and groups who use the term evil to abuse the innocent by invoking fear?

Prompt:

Often our readings suggest that those who use the word evil to accuse others are often the ones who are frequently unethical themselves and, in a few cases, actually guilty of committing crimes against individuals and/or humanity. History furthermore suggests that the word evil is often used to discriminate against and disenfranchise individuals and groups by invoking fear of those who are different in some way.

Using three (3) of the works we have covered during the second half of the term decide who can best define evil and how we can guard against individuals and groups who use the term evil to abuse the innocent by invoking fear.